Troubleshooting - Panasonic CQ-C7703N Operating Instructions Manual

Troubleshooting

If You Suspect Something Wrong
Check and take steps as described below.
If the described suggestions do not solve the problem, it is
recommended to take the unit to your nearest authorized Panasonic
Service Centre. The product should be serviced only by qualified
personnel. Please refer the checking and the repair to professionals.
Panasonic shall not be liable for any accidents arising out of neglect of
checking the unit or your own repair after your checking.
Never take measures especially those other than indicated by italic
letters in "Possible Solution" described below because those are too
dangerous for users to handle themselves.
Problem
No power to the
unit
Sound is not
generated.
Noise
Noise is made in
step with engine
revolutions.
Possible cause
The power cord (battery, power and ground) is connected in the wrong way.
a Check the wiring.
Fuse blows out.
Eliminate the cause of fuse blowout and replace the fuse with new one.
a
Consult your dealer.
MUTE is set to ON.
a Set MUTE to OFF.
There is contact between the external mute lead and the chassis.
a Connect the external mute lead correctly. If the lead is unused, insulate it.
The wiring of speaker lines are not correct, or a break or poor contact arises.
Check the wiring in accordance with the wiring diagram. (Installation
a
Instructions)
There is an electromagnetic-wave generator such as a cellular phone near the unit or
its electrical lines.
a Keep an electromagnetic-wave generator such as a cellular phone away from
the unit and the wiring of the unit. In case that noise cannot be eliminated
due to the wiring harness of the car, consult your dealer.
The contact of the ground lead is poor.
Make sure that the ground lead is connected to an unpainted part of the chas-
a
sis securely.
Alternator noise comes from the car.
Change the wiring position of the ground lead.
a
a Mount a noise filter on the power supply.
Warning
¡ Do not use the unit in an irregular condition, for
example, without sound, or with smoke or a foul
smell, which can cause ignition or electric shock.
Immediately stop using the unit and consult your
dealer.
¡ Never try to repair the unit by yourself because it is
dangerous to do so.
Possible solution
a
CQ-C7703N/C7303N
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